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Affordable Quality for the Timex Computer User

April/May

QUICKSILVA

THOMAS B. WOODS

21st CENTURY -f^HUNTER
ELECTRONICS JDANTA
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SUPPORT FOR THE 2068

HARDWARE

BANK SWITCHING FOR THE TS 1000 Part 2
Expand To 96K - by Paul Hunter

PROGRAM

LJ U LI I — I for your 1000-1500 computer

REVIEWS

iBULk RATE!
(US POSTAGE I
i PAID 1
i PERMIT#! 51 i

Por tsmdu th
Oh i o
45662

BACK ISSUES OF T-S HORIZONS ARE NOW AVAILABLE

Each issue brings you approximately thirty-two pages of usable information,
prograiTi listings, product reviews, programming articles, hardware projects, and
applications you can use in your home or business. T-S HORIZONS features
nationally kncwn writers like Gordon Young and Paul Hunter. And now you can get
the back issues you missed for only $1.25 per issue!

Issue HI Creating and Saving Files, Uninterruptible Power Supply, Repeat Key
Module, Numerical Analysis, and more!

Issue #2 Memory Reduction, Matrix/Cursor Input, User-Friendliness, Graphics
Tutorial, Reset Switch Project, and more!!

Issue H3 Animation, Simple Loading Aid Project, File Protection, Differential
Equations, Ham Radio, and more!!!

Issue H4 Bank-Switching for the TSlOOO-Part 1, Error Recovery, TS2068 Edge

Connector Schematics, Converting to T/S BASIC, Simpson's Rule, more!!!

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BANK BWTTCHNQ FOR TIC T8 1000 Ppl 1
Expond To B6K • by Htfipr

Enclosed is
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-S Horizons for

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Back Issues, 2002 Summit St., Portsmouth, OH 45662

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Affordable Quality for the Timex Computer User
2002 SUMMIT ST. PORTSMOUTH. OHIO 45662

Table o-f Contents

FORMAT

SIZE*

Full page

6-1/4 X

$125

$119

ENTER

2/3 page

4-1/2 X

100

Guest Ed i tor i al

1/2 page

6-1/4 X

4-1/2

by Stan Ue i t

3 X

Reader INPUT

1/3 page

4-1/2 X

4-1/2

Program Tips

2 X

by Rois Harder

1/4 page

3 X

4-1/2

Numerical Analysis

1/6 page

2 X

4-1/2

by Ken Lewis

1/9 page

2 X

"WORM" Word Processor

2 i nch

2 X

by Gordon Young

1 i nch

1 X

TS 1000 Bank Switching

*No charge

■for ad 1

reduct

i on .

by Paul Hunter

FORMAT; Black and

white

only.

Ads

Graphics Program

may be reproduced ■

from an ad in

an-

by Johnson and Swartz

other publ i cat i on .

Reviews

CLOSING DATES; 15th o-f

month

pre-

T-S NEWS

ceedi ng i ssue date

USR NEWS

FREQUENCY ;

Monthl y

•

Ther^^s something NEU on the horizon.

QUALITY, UTILITY, ACCESSIBILITY, AFFORDABILITY.
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Don^t miss an issue. Subsribe NOU!

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I have enclosed $12.00 for a one-year <12 issue) subscription.
^18.00 Canada. $20.00 other foreign.

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2002 Summit St. subscr i pt i on wi th

Portsmouth, OH 45662 the C __i ssue .

Dear Fellow Timex and Sinclair Computer Users,

Thank you -for your patience. T-S Horizons is intended to be
monthly but as you can see, you are holding the April/May issue oi
T-S Horizons in your hands. Income tax matUrs were only one ot
the reasons we are late. At any rate thank you tor bearing with
us.

There is a lot ot news concerning the Timex computing world these
days - largely bad news, but enough good news that we are
encouraged. Ue hope you will be too.

I got some critical comments regarding last issue's cover, and I
suppose 1 deserve it. Tm usually an optimist but Timex's
lay-down-and-die attitude really upset me. The *2068 tombstone*
represented the Timex Computer Corporation only, and not the
TS-2068 itself, Timex users in general, or the future of T-S
Horizons. Actually I'm optimistic about the last three.

Hope for the TS-2068?

Due to recent ads selling Timex products at 1/2-off and last-minute buying by TS-1000 owners, the
stockpile of TS-2068's at Timex is nearly gone. All of the TS-2040 printers have been sold (except for the
few being returned by dealers). Some software and TS-2020 program recorders are still available for an
unknown period of time. The TS-1000 is out of production. However the TS-1500 is still being made on a
limited basis for educational use. (You know, those correspondence schools that advertise in magazines
like Popular Hechanics, that offer to teach you how to program and give you a free computer.)

However if you've heard rumors that someone is seeking the rights from Timex to market the TS-2068 and/or
TS-1000, they're not just rumors. Our sources at Timex say no less than 20 parties are inquiring about the
prospect - some of them seriously. As we understand it Timex will manufacture the 2068 if they can get a
firm order for 25,000 units. It will be the same machine, but will not carry the Timex name. (This makes
some sense. Timex was perfectly happy with the TS-1000 as long as it was *selling itself.* But when they
really had to market it and the 2068, they dropped them.)

So it seems there is some hope for the Timex (?) computers. (Notes Clive Sinclair still has made no
reassuring gestures to American users.)

Publishino - Another One Bites the Dust

- In case you haven't heard Sync has sunk.

The March/April issue was the last. When 1 heard the news, 1 called their offices to find out why.
Incredibly, the guy 1 talked to said it was because Timex got out the computer business - as if they
thought all of us loyal Timex users would say, *Well Timex is gone. Let's all go buy Ataris and cancel our
subscriptions to Sync!* When I reminded him that when Sync was first started there was no Timex computer -
only the 2X80 - a Sinclair computer importad from England, he said he never thought of it like that. 1
suspect the true reason was a falloff of advertising income due to excessive ad rates.

- Timex Sinclair User is still dead, despite rumors to the contrary. The only hope 1 see is if they get
dollar signs in their eyes over Sync's dropped advertisers.

HMEX TakM A Liekiac

BAM( 8WITCHNQ FOR nc TS tOOO Fwt 1

Exftnl To MK • by PaU HiMw

S Hiriiinj

MWM* IV M Tlm« CompiMr Unr

Another one bites the dust...

- Bad news for TS User (newsletter) fans. Despite the big talk in the April issue <*If you are a (TS User)
reader then you are OK. TS User is full of optimism. TS User will continue production and coverage of
Timex and Sinclair Microcomputer products...), in a recent phone conversation, Derek Stubbs informed me
that his company was moving on (into robotics and software development - not Timex software), and dropping
the Timex market. He had offered in that same issue to establish a clearinghouse for third party
merchandise but, of course, that will not materialize now.

So what's left?

T-S Horizons. To be honest 1 hate to see Sync, TSU(mag), and TSU(nl) go. They were all good resources for
us at T-S Horizons and other Timex users. But TSH is here to stay. We may be late occasionally but trust
us - we plan to be around for a long time.

Some other worthy T-S dedicated publications are:

-SyncWare News, P.O.Box 5177, El Monte, CA 91734 (for the technically inclined - a nice publication).
-Basic, 3705 Biscayne B1., Miami FL 33137 (BASIC programs for the ZXBl/TSl 000/1 500).

-Syntax, RD 2, Box 457, Harvard, MA 01451.

-Also see USR News for some very good Timex Sinclair user group newsletters.

In addition there are two other magazines we would like to mention:

-The Computer Trader (1704 Sam Drive, Birmingham, AL 35235). This magazine covers all computers, from
Apple to 2X81. In a typical Issue there are four to six articles for the Timex-Sinclalr. Currently they
are running an excellent machine code tutorial series.

-The Computer Shopper (P.O.Box F, 407 S. Washington Ave., Titusville FL 3279d). In a recent phone
conversation with the magazines' editor, Stan Veit (who provided this issue's Guest Editorial), I was told
that they are planning to add two new features for Timex-Sincal Ir users: a general Information-type column
and a telecommunications column specifically for Timex users.

Third-Party Support

Although a few companies are getting out of the Timex-Sinclalr market (most notably Memotech), most of the
significant software and peripheral companies are hanging in there. The folks at Byte-Back told us, their
business has tripled since Timex 'pulled the plug.* 21st Century Electronics has a full line of TSIOOO
products, and is developing many TS20d8 products. They have 5

A GUEST EDITORIAL
by STAN VEIT of The Computer Shopper

It is almost two years ago
since I attended a press lun¬
cheon at the Tavern On The
Green in Central Park, New
York City. The purpose of the
meeting^vas to announce that
Timex Corp had formed Timex
Computers and would take
over the sales of Sinclair Com¬
puters in the United States,
Clive Sinclair was there in
smiling fellowship with the top
brass of the Timex Corp. Their
message to' the press was that
Timex (who had always
manufactured the ZX80 and
ZX81 low-cost computers),
would now apply their
marketing expertise to com¬
puters as well as watches. They
would also provide extensive
software and peripheral sup¬
port to the Sinclair machines
making them highly useful to
small business, education, and
science.

We members of the press
were impressed. Here was a
company who’s watches and
clocks had a reputation for
low-cost and quality and they
were going to bring the same
qualities to low cost com¬
puters! We believed it as much
as the Timex people did.

Timex upgraded the ZX-81,
which they called the TS-1000
by adding-additional memory.
They advertised the computer
and sold thousands of them
throughout the country. The
Timex TS-1000 became the in¬
troduction to personal com¬
puting for many people.

A few months ago Timex
fired all the people left in the
Computer division and folded
it into the watch operation.
Then last week they complete¬
ly got out of the s^es of com-
6 puters, explaining that they

couldn’t make any money from
them. Small wonder, the
TS-1000 that cost me $99.00
plus $49.00 for the 16K
Memory Expansion was now
selling for $39.00, with the
Memory Unit and some soft¬
ware!

I blame the VIC-20 and
TRS-80 Color Computer and
the TI 99/4A for the final death
of the TS-1000. VIC-20 and
CoCo showed the public that
you could get a real computer
for ^bout the same price as the
Timex plus the expansion
module. They both had real
keyboards and good software.
You could get reliable cassette
loads, or just plug in a cart¬
ridge and use the machine.
There were third party expan¬
sion units that worked. Radio
Shack and Commodore even
provided a printer and disk
drive for those who could pay
for them.

Now nobody expects a com¬
pany to stay with a money los¬
ing product, but when you sell
millions of items to the public
you have some responsibility
toward those who bought the
product on the basis of your
claims about its merit.

Sinclair was not much help
to the users of their machines,
but they made no bones about
it. You understood when you
bought a ZX80 or ZX81 that
you were pretty much on your
own. Timex however promis¬
ed to do better, they offered
help from such things as the
user hotline (1-800-24TIMEX)
and the COMPUTER CLUB
and a Newsletter. None of it
ever worked. The Hot Line
was usually busy and if you got
through, the chances were that
they couldn’t answer your

questions and they never call¬
ed you back. The other support
mechanisms for the 2068 might
have worked if Timex hadn’t
fired Dan Ross and his staff.

The notice of the complete
demise of the Timex Com¬
puters came through a one
page P.R, Release from Ruder,
Finn & Rotman who do the
public relations for Timex. It
was dated February 21, 1984
and said that Timex was
withdrawing from the home
computer business. It quoted
Mr. C.M. Jacobi, Vice Presi¬
dent of Marketing and Sales for
Timex whP said,’ We believe
instability in the market will
cause the value of inventories
to decline, making it difficult
to make a reasonable profit.
Further, we are concern^ that
those conditions will strain
trade relations between
manufacturers and retailers, a
relationship which the com¬
pany values very highly.’ Note
that he says nothing about rela¬
tionships between the com¬
pany and computer users! In
regard to service of Timex
Computers, Mr. Jacobi said,
’Consequently, the company
has decided to withdraw from
the retail portion of the home
computer busisness. Consumer
warranties will be honored and
out of warranty service will
continue’.

We called Mr. Jacobi to ask
him to expand on the com¬
pany’s support policies. We
asked questions about the level
of support that Timex would
continue to offer for software
and the sale of proprietary
chips and peripherals. We
never got to speak with Mr.
Jacobi. His spokesperson said

‘We are considering the
answers to your questions, we
will call you when we have
answers for you’. They never
called back.

We then called the P.R. firm
who said, ‘We can not give you
any additional information,
call Mr. Jacobi at Timex <

I wish you could see some of
the letters we have received
from Timex/Sinclair users.
They believed in the product
and spent a lot of money on it.
I myself, taught a course in
Timex/Sinclair Programming
and purchased a computer for
$99, a 16K Memory Expansion
for $49, a Printer for $99, a lot
of books and software. I have
about $400 invested in this
machine and I know others
who spent a lot more. We
never expected a company like
Timex to ditch us without any
consideration. If they were as
concerned for their customers
as they are for their dealers,
they would still be in the com¬
puter business.

Is the Federal Government
going to let them get away
with this one? Are Computer
Owners as important as Snail
Darters? It is one thing for a
Company to go Chapter 10 or
Chapter 11 (Bankrupt) and
end belly-up, its another thing
for a solvent company to just
dump customers who bought
their products in good faith.
We are consumers who need
protection, the Very Low Cost
Computer User is an En¬
dangered Species!

. Don’t write me about it,
write your Congressman!

secured the rights to Tintex's word processor for the 20d8, which
they say is as good as an/ UP for an/ computer on the market.
(2l5t Century, 6813 Polk St., Guttenburg NJ 07093,

210-869-2616). Gesang Associates (P.O.Box 452, Randallstown,

MD 21133, 301-922-0767) also has a full line of TSIOOO and
2068 products.

All of the following companies are expanding their product lines
or maintaining status quo (in addition to those who have ads in
this issue); 6. Russell Electronics, E-Z Key, Aerco, E. Arthur
Brown, Computer-Wear, Paul Hunter, Rorapak. Thomas Woods has been
especially vocal about his support for the Timex computer line.

The Future?

There are encouraging signs for Timex-Sinclair users.

-Timex User Groups are as active as ever.

-New companies with new products are still coming out; JRC
Software (see T-S News); Hinny Electronics Graphics and 64K

package for the TSIOOO (see last issue)} Interface Design High
Speed Interface (see TSH #3).

-Some companies and user groups are trying to 'import* support for
the TSIOOO and 2068 from English Sinclair users who weren't
subjected to Timex's demise.

Hopefully some good will come of it.

-As 1 stated above the TSIOOO and 2068 may be resurrected in the
near future under a new name.

One thing that is important for us to do now is to 'strengthen the
things that remain.' Companies that are now supporting TS-related
products need to know there are people 'out there* who are hanging
on and will buy their products. I think if we all band together we
come through this in great shape.

Rick Duncan

50BB

TIMEX

QUICKSILVA
THOMAS B. WOODS

? ?

21st CENTURY ^

ELECTRONICS Banta ,

BYTE-BACK Sonw^UtE

- o. misscii E-z

_ ?_ JRC ?

,6,,i,R20 ? SOFTSYIMC

Dear Rick,

K E H L-' t H!

INPUT

I would like to clear up a misconception that
Art Gindin has about VU-CALC (TS-Horizons #3
Memocalc). I also experienced the same
difficulty trying to get a print out on my
Seikosha GP-IOOA printer and I also blamed
the software.

I believe the letter points out sufficient
problems to warrent making future 2068 users
aware of.

Mr. Heifner has been a valuable asset to our
group in evaluating and reviewing new pro¬
grams for our newsletter. I hope you find
his article as valuable as I did.

The truth is that the Memotech interface and
Seikosha printer will not accept Sinclair
graphics (in this case the black bars that
make up the grind in VU-CALG) . Many Sinclair
programs will not print on the Seikosha and
those that do will print in a 32 column
format. (Syber Software makes a cassette
program called MEMOSHA which will correct
this problem but I have not been able to get
it to work and it requires extensive program
modifications which I think would be beyond
the capability of the type of reader Art is
aiming his articles at). VU-CALC should not
be "abandoned" however because it will accept
text in the grid which Memocalc will not.
The problem is not in the documentation. It
works fine with the Timex 2040 printer and
the ZX-81 printer . I have encountered many
people who have run .into this problem and it
may be worth mentioning in your magazine. I
did hear of one individual who reprogrammed
VU-CALC with an acceptable ASCII symbol such
as "$" instead of the graphic bars.

I hope you will forward this information to
Art and hopefully to your readers. Apparent¬
ly Memotech, Sinclair and Timex are not
giving it out.

Very truly yours,

James A. McKnight

3708 Strayhorn

Mesquite, Texas 75150

Gentlemen,

Enclosed please find article on Timex Program
8 VU-CALC for the T/S 2068.

Peter J Callinicos
President

MILE HIGH CHAPTER TIMEX USERS

FROM: Mark A. Heifner

37 E. Colorado Ave.

Denver, CO 80210
(303) 744-1137
(303) 722-9067

TO: Timex Computer Corporation

Several weeks ago I purchased a copy of the
Vu-Calc for the 2068 and was eager to use it
for my business application, having found the
Vu-Calc for the TS 1000 very useful, but
rather limited. I was immediately impressed
by the expanded number of rows and columns,
the more creative method of working with
data, and especially the almost limitless
number of formulae that could be entered - a
severe problem with the TSIOOO program.
After a few minutes I realized that the
program was essentially useless for any
serious applications and I had to return it
for a refund.

Two aspects in the 2068 Vu-Calc make it
difficult to use. One is the lack of sepa¬
ration between the boxes. When all the boxes
are filled on a certain portion of the
display the only way to distinguish between
one box and an adjacent one is to move the
cursor around. All the numbers run together,
end to end. Although that problem is manage¬
able but a nuisance in comparison to Vu-Calc
for the 1000, one other problem cannot be
remedied in any way.

In writing the program it apparently was
decided that a display of 4 columns instead
of 3 was important. Because of the limited
space on the 2068 display in normal mode it
was necessary to drop the lines separating
the boxes and reduce the number of numeric
entries in each box to 7 from the 8 as in the
1000 version.

Vu“Calc, like its big brothers and sisters
Visicalc and its variations for the larger
computers, is most useful for working with
dollars and cents. Seven entries, including
the decimal point, limits the program to
values less than $10,000.00 whereas the 1000
version allows figures up to $100,000.00. I
am sure you can see that this limitation
makes the program useless for all but the
simplest application.

As I see it, the deficiencies of the 1000
program were corrected quite well, but in the
process nobody apparently noticed that a new
set of problems had been created that pro¬
duced a program which is almost useless. The
2068 is a very capable machine with lots of
dandy features and I was both surprised and
disappointed that such a trashy program had
been allowed to go out on the open market. A
few suggestions might be helpful to correct-
ing this situation with this program.

A lot of people I know that have the 2068
have gone to using monitors rather than a TV.
The picture is so much better on the monitor
and good monitors are nearly as cheap as a
good black and white TV. Why not produce a
Vu-Calc which uses the expanded display
modes? If a printout is needed on the 2040
printer I am sure it could be worked out that
two consecutive printouts would be sent to
the printer with each printout showing half
the screen. Alternatively, you might return
to a 3 column display with separations or
even a 2 column, dual screen display or some
variation on that. The Important thing is to
maintain many of the features already there
but allow at least 8 numeric entries per box.
Maybe it could be worked out that the user
would even be allowed to select the number of
entries per box, up to some reasonable limit ^
and the display would adjust itself accord¬

ingly. I doubt that having more than 9
entries per box would be useful. I do feel
that a minimum eight is needed.

In conclusion, spreadsheet programs are so
very useful it seems a shame to produce a
program for the 2068, a very capable machine,
that is essentially useless when compared to
the similar program for the 1000.

INVASION OF RUSSIA,
JULY, 1941

16K, 32K, or TS2068

You command the German Invasion of Russia to take
Moscow.

T/S 2068 Game has:

• Large map of Eastern Europe and U.S.S.R.

• Diyisional and Brigade Strength-Panzer, Infantry, Calvary, etc.

• Supply lines • Zone of Control

• Effects of terrain and weather

• Actual Reinforcements

• No fast reflexes required.

32K-IDENTICAL TO TS/2068, EXCEPT:

• large 4 screen map board • No effects of terrain
16K-IDENTICAI TO 32K GAME, EXCEPT:

1 screen map board
T/S 2068 -

00 S « H

32K

16K

- $17.9^V

- 17.95 1+ $2.1

- 14.95/

VISA & Mastercard Accepted

Dealer inquiries welcome

SHARP’S

127 NINE MILE RD.
SANDSTON, VA 23150
(804) 737-4895

A message from THOMAS B. WOODS

Dear Fellow Timex Computer Owner,

The bad news that Timex has dropped out of
the personal computer market comes to me as a
Itremendous disappointment. I put my faith in
their machines and for the last two years
have worked long and hard to build a software
business with a reputation that I think is
one of the best in the industry.

In the current situation all of us are
wondering what will happen next. There is
one thing I'll say, however. When the dust
settles, I intend to still be here. I am
determined to continue providing quality
software for both the TSIOOO and the new
TS2068.

I owe my business to you who use these two
marvelous machines, and you deserve far more
than to be simply dropped and forgotten. I
for one. Intend to keep my computer running.
From me, you can expect to see an optimistic
future of more programs and more applications
for the Timex.

It is in this rallying spirit that I announce
my latest product: PRO/FILE 2068. The
original, release date was scheduled for June
1984, but with circumstances being what they
are, I feel that this program released now,
will demonstrate my dedication to the support
of the TS2068.

The manual for PRO/FILE 2068 is not yet
complete, but the program itself is finished,
extensively tested, and is ready to be
shipped with abbreviated operating in¬
structions and a promise that the
manual- -expected to be 100 pages — will be
mailed to every customer just as soon as it
is printed.

Enclosed is a detailed description of
PRO/FILE 2068. You'll notice right away that
this program is a significant advance over
the older but still extremely popular ZX
Pro/File used on the TSIOOO and 1500.

PRO/FILE 2068 is a masterpiece if I say so
myself!

By pulling together, by communicating, and by
sharing ideas and talent, I am convinced that
we Timex computerists will emerge from the
present chaotic state unscathed, and the
computer itself will be as strong and popular

las ever.

FOB JTIST YOU CAN

QRAB THE BOLL EY THK HORIIS

TOCO TECHNOLOQY

•nnounces Stock Market Software
for your TIMEX 1000 and TS g066

The TECHNI-ETOCK SOFTWARE SYSTEM la a stock
market analysis program designed by a pro
trader for use by pros and beginners alike.
The program analyzes your favorite stocks
using statistical and technical averages In
order to predict future stock price trends.

The System Includes:

1 ) HANDSOME BINDER

2) 26 PAGE INFO GUIDE

3) RESEARCHED WORKSHEET

4) REFERENCE SYSTEM

«:) PR0®A>D1ED CASSETTE

To Order: Send us the names of your favorite
6 stocks along with a check for
$24.9? for the TIMEX 1000 version
(9 stocks and $34.9? -TS 2066) to:

for use
1 6K or more

TCX:0 TECHNOLOGY $3

POBOXBB shipping

SAN1 A CLAUS. IN 47S7»

As always, GOOD COMPUTING!

Thomas B. Woods

P.O.Box 64, Jefferson, NH 03583

ZX PRO/FILE

A machine language information storage
and retrieval tool for 16-64K.

* Multi-word search capability
A Instant file access

* Ordered displays

* Definable printer functions

* Totally flexible file size

* 59 page tutorial manual

* Newsletter updates

THE MOST ADVANCED
FiLE MANAGER YOU CAN
GET FOR THE TIMEX

Ask for free specifications or send $16.95
for cassette and manual to:

THOMAS B. WOODS

P.O. Box 64, Jefferson, NH 03583
Phone: (603) 586-7734

Vi<ui Mastercard welcome

^^^AstfFreeTSIOOO

orTSZOBB

.j?** ^*®^j**9

i??i/aa@8®8!i‘.iaesi4 with catalog

FREF MC i)rog(<»ni UsItriQ and raiai'oq wiin S A S F. I'JOc onsl i

Ron LeMon, 1601 W 400 S. #86, Sail Lake City. UT 84104

TIMEX-SINCLAIR programs to save you money.
I Payoff shows how much credit card and charge
accounts really cost, how to pay them off and
save $$$. Payout shows where your hard-earned
money is going. On cassette, $12.95 each post¬
paid. Specify TS-1000 w/16K, TS-1500 or TS-
2068. Ace Software, 2 East Oak Avenue,
Moorestown, NJ 08057

GOLFERS

GOLF HANDICAPPER is a menu driven 16K BASIC program
for your TS 1000, 1500, ZX81 which computes/saves/
updates USGA handicaps for up to 48 players. With
a printer attached you can print out scores and
handicaps for all players. High quality cassette
tape shipped in hard box and accompanied by full
documentation. Send $20 ck/mo to John Carson
11200 Lockwood Dr. #307 Silver Spring, MD 20901

*****MICR0-L0AD*****

HAS

UNUSUAL SOFTWARE FOR
TS1000/ZX81
BOX 1095, T OR C, NM
87901

Send. BASE for information.

CLASSIFIED AD

PR06IWIS for SCIENCE/HEALTH/
MATH/ELECTRONI CS/HOME . Free

catalog tor SASE and 40 cents
postage. MAH Software, 341 West
Eagle Lake Drive, Maple Grove,
m 55369. 1 1

NUHERICfiL QNhLYSIS

LEAST SQUARES METHOD OF
CURVE-FITTING POINT DATA TO

y=ax+b or y=be
by Ken lewi s

The standard approach to fittinf^ a

set of data points to a line y=ax+b

is to use the method of least

squares. The least squares method

provides an unambiguous fitting

procedure which minimizes the

deviation of the data points frcxn

the fitted line in the following

sense. Let Y. represent an

experimental value and let be a

value from the equation y=ax^+b,

where xj is a particular value of

the variable which is assumed to be

free of error. It is desired to

obtain the "best" values of a and b

such that for e. = Y . -y . =Y . -ax . -b ,
1 1^11 1 ’

N 2 N 2

the error E= 5 eT= ;jg(Y.-ax.-b)'^ is

i 1 j 1 1

a minimum, where N is the number of
data points. Since xi and Yj[ are
unaffected by the choices of a and
b, the minimizing relations are
dE/da=0 and dE/db=0. These result
in the two equations:

both sides to get In y=ln bt-ax, and
define y^=ln y and b^=ln b. Now we
have y'=ax+b’ , so the method
outlined above applies.

THE PROGRAM

To execute, this program, enter the
"RUN" mode. The first prompt is
"INPUT PAIRS OF DATA" and "ENTER
POINT 1". The point is entered as
follows: x^, enter, y^, enter. The
new prompt is "ENTER POINT 2" and

the answer then appears with a and
b expressed numerically.

EXAMPLE

Fit a straight line to the given
data using the least-squares
criterion .

1.1

2.9

4.3

6.2

f(x)

25 .

a Sx?+b Sx.= Sx.Y
]_ 1 11

a 2 Xj. + bN = S Y^

Solving for a and b, these values
can be expressed in terms of the
input data only:

After entering the "RUN" mode, we
iirmedtately get the prompt "INPUT
N-NO. OF DATA". Since there are 4
points, enter the number 4. In
response to the prompt "ENTER POINT
1", the values 1.1 and 50 are
entered . We are then

Sx.Y^

SY^ 5 N

— b=

SXi SY.

_ 2

SXi sx.

S Xi2 S Xi

S Xi E N

This is the least-squares method.
The approach can be appl^^ to fit
data to the curve y=be‘^ in the
following manner: take the log of

proipted;' TINIER POINT 2", and
the values 2.9 and 43 are
input, and so on. The answer
is printed out, i.e. ,

"THELINE WHICH FITS THE DATA IS:

Y=5.3011G18*x + 55.716711 "

lO REM L5T5QC'

REM i_ER;5T SOURRE FIT TO
30 REM R LINE FOR N E^RTR
>.'3 DIM Xi 100:1
36 DIM F ( 100 :i

4-0 PRINT "INPUT N-ND. HF OCTC”
50 INPUT N
55 CL 5

60 PRINT "INPUT PflTP;=. HF naTO-

10 REM L5T50X

b-95'r "SOURRE FIT TO
30 R^M B*c/.P i:fl^x:i FOP N
DIM Xi:i00i ”

36 DIM F I 100 -I

TmI-? N-NO. of Di:

INPUT N
55 ULS

P0 PRINT "INPUT DaTD<^ ,-,cr r.,-

FOR K=1 TO N

FOR

K=1 TO

INPUT .>:. 1 K '1

I NR

JT >: 1 K 1

INPUT FiKi

I NR

UT F ( K 1

100

NEXT K

LET SUMi=0

CLS

LET

F iK) =LN

110

LET SUM2=0

HEX

T K

120

LET 5UM3=0

100

LET

SUM 1=0

130

LET SUM4.=0

110

LET

SUM 2 =0

14-0

FOP. L=1 TO N

120

LET

150

LET SUMl =SUM1+X IL)

130

i-ET

SUM 4=0

160

LET SUM2=SUM2 + X' (L'! *>:' I'L'!

14-0

FOR

L = i TO

170

LET SUM:3=5UM:3 + F iL'i

l50

LET

SUM! =Fi 1

160

LET 5UM4.=5UM4- + X 'L' +F n't

160

LET

SUM2 = 5U

150

Nt:XT L

170

LET

5UM3=5U

200

LET D = 1 •' f N*5UM2-:5.UMl-^;=ii iMii

160

LET

Si iMm. =:=,.■ 1

2X0

LET A0= i 5UM2*5UM3-SUMl-»-:=iUM4

150

NEX

r L

220

LET PI = I -5UM1-»5UM3 + N*5UM4.:! *

2 00
210

LET

D = 1 y H *
A0= iSUh

5 PRINT "THE LINE UHICH F
DRTR 15:"

? PRINT "■

5 PRINT "Y= ";R1 ;“•»>; + " :

) STOP

230 PRINT
HE DRTR IS
2^0 PRINT
£ w’ 0 P‘ K X N"^

’ ; H X ■ ‘ X

260 STOP

Cl D=l/ (N^SUfiS-SUf-li-^^a !H-
ET R0= ! SUM2'»5UM3-SUMl-^:5i.

P'i' Hi= -SUM1*5UM3+N*5UMj

PINT "THE EXP WHICH FiTi

; EXP ( R0 ) ; " *E')

PROGRAM

EDUCATION

• NEW FOR TIMEX/SINCLAIR 10(X)/ZX81 16K.

Dual Purpose Academic Programs

• Challenging. Self-Pacing ... Tailored to Specific
Interests and Abilities.

• Software Written In Basic ... Easily Understood ...
Not a Bit of Machine Code.

Full Documentation Package

□ RISING SUN . $14«

Tour Japan, facts, geography (12-Adult)

□ LONG DIVISION TUTORIAL. .$12“

A dedicated tutor ... not flash cards (8-10)

□ AREAS OF CONCERN . $13“

Areas, perimeters, discovery, fun (10-13)

□ THANKS MR. NEWTON .... $13“

Laws of motion, serious graphics (16-Adult)

□ VINS FRANCAIS . $14“

French wine guide (Adult)

(CT residents add 7.5% sates tax; Outside USA add 15%)

~~| I All software on high quality

t cassettes and is replacement

- - guaranteed.

— - To order, send check or

V _ money order to:

— C _ tag software

I I \WJI \ P.O. BOX 688

RADIO SHACK COMPUTERS

AX DISCOUMX PRICES

» FULL RADIO SHACK UARRANTY

* PURE RADIO SHACK EQUIPHENT
•MAIL ORDER DISCOUNT PRICES

* FREE SOFTWARE WITH EACH COMPUTER SOLD
» FREE BOOK 'HOW TO GET RICH WITH YOUR

MICROCflHPUrER* WITH
EACH COMPUTER SOLO

• W SALES TAX ON OUT OF STATE SALES

• FULL LINE OF PROOUaS

pBOEMMai

NAUGATUCK, CT 06770

TIMEX/SINCLAIR 1000/ZX81
TRADEMARK TIMEX SINCLAIR

Do you need a word processor that will work
on any printer with the interface you have?
Would you like to write your text in 30, 40
or whatever column width you want? I know I
did! MEMOTEXT requires the MEMOTECH inter¬
face, WORDSINC II only prints on the Timex
printer and the others (those with names I
forgot after finding out they did not work
very well), fell short of working on the
machine code, I came up with a usable pro¬
gram, which I have called "WORM", for lack of
a better name. This program has:

**Left/Right justification
**User defined column width
**6,000 character text file
**Dual mode operation
**Global editing (insert/delete)

**Character counter

**Upper/Lower case (for full size printers)
**Machine code fast typing
**Wrap around screen operation
**And more

The nice thing about this is that, you can do
all the programming for it by reading this
and 2 more issues of this magazine.

If you have never worked with machine code
and are afraid to tackle this, don't be.
Just follow directions closely. This month I
will provide you with the first steps. Once
we get the machine code entered, the rest
will be much easier. There is over 2K of
machine code that is entered into 4 REM
lines. I will provide you with an assembler
to enter the codes and a listing of the codes
in each line. In addition, a checksum can be
-j/j, used to test your entries for assurance. We

will make your 16K TS-1000 computer a very
usable word processor.

Begin by turning on the computer and putting
it in the FAST mode. Now make line 1 just
like that in figure 1. After typing all of
this in, press ENTER. It must be exactly
like the figure shown! When this has been
done, create line 2 with exactly the same REM
statement as in figure 1. Do this by using
the EDIT command, then press DELETE, which
will erase the line number "1". Then press
2. Repeat this procedure to create lines 3
and 4, with the same REM statement.

At this time, SAVE everything onto tape! DO
NOT attempt to edit these lines again.

FIGURE #1

FIGURE #2

Now, enter the BASIC assembler of figure 2.
This will be used to enter the codes. When
entering codes for line 2, 3 and 4, you will
have to change the address in line 9977 (more
on that later). You should now have four REM
lines and the assembler starting at address
9977. Again, SAVE everything onto tape (use
the other side of the tape just as a
precaution).

When using the assembler, you will be
entering the codes as listed in figure 3. In
using the assembler, you simply enter a code
(press ENTER) and continue until you reach
the end of the listing. The machine code
list has 6 codes across and are to be entered
left to right, top to bottom. You can make a
correction by pressing 333. This will
backspace and correct a wrong entry. You
might want to stop and SAVE your entries
along the way and to do this, just get the
recorder ready and press 555. When all the
codes have been entered, enter 999 to stop.

Now you should have line 1 finished and can
check your entries by a simple checksum
routine that adds each number in the line to
produce a sum of all your entries. Do this
by entering:

If you RUN the program at line 3000 you
should get the sum: 58243

If this is the answer you got, then so far,
line 1 is complete! If not, you need a
program that will PEEK each address between
16514 and 17154 to check your entries. I
have found that some of my readers will
accidently make a wrong entry and not get the
checksum number correct. If this is your
case, add these lines:

This will help locate an error. You will
still need to determine the address and make
the correction.

Next month I will, give you the codes for
line 2 and 3. I can't over emphasize the
importance of your machine code entries. A
wrong entry could crash the program or worse,
write a hundred wrong entries over others, so
be careful! You should have no problems, but
if you do, write me and I will help you out.
More in the next issue!

Gordon Young
P.O.Box 2411
Vista, CA 92083

122

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BANK SWITCHING FOR THE TS 1000 - PART 2
By; Paul Hunter

The second part of this series will describe
some of the hardware so that construction
work can progress while the software is
developed and tested.

It seemed probable from the outset that more
and more peripherals would be added to the
system as time passed so the first task was
to build an expansion interface to buffer the
TIMEX/SINCLAIR signals. Such expansion
boards have been described in the past and
this one is not much different.

EXPANSION BOARD

The interface described here uses a "COMPUTER
CONTINUUM" board (since I had one) but the
circuit can equally well be put together on
perforated project board with wire wrap or
point-to-point wiring. The "COMPUTER
CONTINUUM" board is very well made, costs
$35, and makes life a lot easier. The board
comes with provision for memory-mapped I/O in
the 8 to 16K region and as a result the
decoding suggested is quite complicated.
Without much loss of versatility, the four
ICs used in the decoding were replaced by
one-half of a 74LS02 quad NOR gate (see
Figure 4) -- partly because I did not have
the 7425 required. The only restriction
caused by this modification is to disallow
use of internal RAM -- it is disabled by
ty ing RAMCS high.

The buffer ICs used on the board are a
74LS245; three 81LS95; and one 74LS365 (or
367). If you put together your own interface
you might prefer to use a combination of one
74LS245 (for data) and three 74LS244 (for
address and control). Such an interface has
been described by JOHN OLIGER in the WINTER
and SPRING issues of SQ. If you wish to
modify a "GOMPUTER CONTINUUM" board for this

interface, the instructions are summarized in
Figures 2, 3, and 4. The interface is
described in Figure 1. Note that the signal
BUSEN is the interface buffer enable (ACTIVE
LOW).

After building the interface, test it by
plugging it into the computer with a periph¬
eral RAM pack. Test the use of the 8 - 16K
space if you have a device that uses that
area. The "COMPUTER CONTINUUM" board can be
inserted into the rear expansion socket of a
ZX81/TS1000 just like any other peripheral.
Alternatively, the ZX81/TS1000 board can be
removed from its case and plugged in verti¬
cally -- this is useful when an external
keyboard has been, or will be, added.

MEMORY INTERFACE

The next step in the project, the memory
interface, was built on a RADIO-SHACK project
board 276-152A using wire-wrap techniques.
This board has a male 22/44 0.156" edge
connector which matches the sockets on the
expansion board. The female connector to
match is readily available at RADIO-SHACK and
elsewhere. The wire-wrap connections used
allow easy modification and later expansion
(and also easy correction of design errors).
The position of the memory interface in the
scheme of things is shown in Figure 5 and the
schematic for the part constructed this month
is illustrated in Figure 6.

Operation of the circuit is as follows; The
device is mapped in I/O space to avoid any
conflict with memory. The 74LS30 generates a
negative-going pulse when A0,A1,A2,A5, and A6
are high and I/ORQ, WR, and A7 are low. This
pulse is inverted and used as the clock-pulse
for the 74LS74 D-type flip-flop. On receipt
of the clock-pulse the flip-flop latches the
data on A3 and A4. The LEDs provide confir¬
mation. Note that no data lines are used in
the device -- this uses up more of the I/O
space but is economical in hardware. The
clear inputs to the 74LS74 are automatically

ftooAf

brought low on power-up or upon loss of Figure 2 Modifications to the COMPUTER
power. CONTINUUM expansion board

After building this part of the interface try
the following test. Plug the board into your
expansion interface (or with a suitable
socket ^directly into your computer) and power
up. Neither LED should be lit at this point.
Since the SINCLAIR BASIC has no IN Or OUT
commands, the routine to service this port
must be written in machine code. Enter the
program:

10 REM 123
20 INPUT A
30 POKE 16515, A
40 RAND USR 16514

Then poke in the machine code:

POKE 16514,211
POKE 16516,201

Now the program can be RUN. When prompted,
enter the address 111 -- the first LED should
light. RUN the program again and enter 119
-- the first LED should go out and the second
one should come on. The address 103 will
clear the latch and the address 127 will
light both LEDs. The outputs of the 74LS74
will be used to switch between memory banks.

In next months installment the memory bank
will be described, the memory interface will
be completed, and if there is room, some more
software will
be discussed.

1. Omit sockets ICl, IC2, IC4, and IC9

2. Jumper together:

on socket 7 pins 13 and 14 (NMI)

pins 15 and 16 (INT)

on socket 8 pins 6 and 7 (ROMCS)

pins 9 and 10 (WAIT)

pins 11 and 12 (BUSAK)

3. Disengage the IC pins from these jumpered
sockets

4. Replace diode D1 with a wire jumper

5. Add the small piggy back pc board illus¬
trated in Figure 3 over the space normal¬
ly occupied by ICl, IC2, IC4 and IC9.
Signals to this pc board are derived as
follows :

BUSEN pin 2 of IC9 (grounded by jumper)
^MCS pin 6 of ICl

RD pin 5 of IC9

DIR pin 8 of IC9 high for read by

CPU low for write

GND pin 7 of IC2

+5V pin 14 of IC2

6. Insert a 74LS02 into the piggy back board

7. Note that both J1 and J2 on the expansion
board are inserted to supply +5V and +9V
to the expansion *

74LS02.

Figure 4

Pigecr{OKj
pin 1 o\ 74L245

(4^14-. BEAo By cpo

U>w I wetTfi ey tf*o

LIT YOUR

TIMEX COMPUTER

WORK FOR YOU

PEfSONAL • BUSICSS • OmTlONAL PROGRAMS:
On cassctt* • menu driven • printar optionai
Availabie tor TS 100(V1 500/2000 Seriee

MAIUNQ U8T*16K: Holds 100 names, ad¬
dresses and phone numbers • Searttm -Soria
• Lists - Changes - Deletes - Prints . . . 9.98

MAIUNQ UST-MK: Does same as 16K only
holds 425 names, etc. . . 9.9S

MAIUNQ U8T-2068: For the TS 2058. Same
as 16K, holds up to 300 names, etc. . . 9.9S

INVENTORY-1 6K: Holds 150 items with com¬
ments (Serial Noe., etc.) Searches - Lists -
Changes • Deletes • Prints . 9.95

INVOITORY-54K: Sams as 16K orriy holds
750 Kerns with comments . 9.95

INVENTORY-2068: For the TS 2068. Same
as 16K only holds up to 600 items . . . 9.98

CHECKINO-18K: Lists 25 deposits - 80
checks - Adds interest - Deducts Serv.
Charges - Searches by #, name, date or
arrwunt - Prints list of deposits, acct. & checks.

. 9.95

CHECIC1NO-64K: Same as 16K only lists 100
deposts - 500 checks . 9.95

CHECKINO-2068: For the TS 2068. Same as
16K only lists up to 100 deposits arrd 350
chocks . 9.95

GRAOEBOOK: Teacher's time saver • Sell¬
adjusting memory - Computes mearrs, stand¬
ard deviations, variance and coefficient of vari¬
ation - Ranks by weighted or unweighted av¬
erage . 9.95

FINANCIAL RECORD KEEPER-16K: Holds
20 files for household or small busmess ex¬
penses arxj/or irxxxne • Reviews, corrects or
charrges information - Prints list for tax pur¬
poses . 14.98

FINANCIAL RECORD KEEPER PLUS-48K:
Does same as 16K - also keeps up to 500
checking transactions - Reconciles checkbook
with bank statement . 19.98

FINANaAL RECORD KEEPER PLUS-2068:
For the TS 2068. Same as above with 350

checking transactions . 19,95

SALES FILE-1 6K: Retail business program
can be used directly as a cash register to keep
records for bookkeeping and inventory. Holds
ISO Hems & 25 accounts • Prinia accounts,
Inventory & receipts . 14.98

SALES FILE-64K: Same as 16K only holds
600 Kerns & 100 accounts . 14.98

SALES FILE-2068: For the TS 2068. Same
as 64K . 14.95

INVOICE CONTROL: Keeps track of, and
prints, invoices for the smalt business. Self¬
adjusts according to amount of memory avail¬
able . 14.95

APPOINTMENT CALENDAR-1 6K: Enler date
and list up to (8) appointments per day for up
to (31) days - Change - Delete • PrirK - Save
on tape . 9.95

APPOINTMENT CALENOAR-2068: Same as
above . 9.95

SEND FOR FREE CATALOG
Any three $9.95 tapes for $24.95 - Add $1.00
per tape shipping - Ind. res. add 5% sales tax
- Sand Cert. Check, M.O., VISA or M/Card No.
w/Exp. Date.

HEATH COMPUTER SERVICES
950 E. - 52 S., Greentown, IN 46936
Phone: (317) 628-3130

A Text and Graphics Program

by Harry Johnson III and Gary Swartz *

This program not only lets you create
graphic drawings, using the directional
arrow keys to plot out a picture, it also
allows you to input text into the drawing.
To insert text, position the cursor at
the desired location using the arrow keys
<5-8), press "P", type in the desired
words or characters, and press ENTER. This
causes the text to printed starting at the
cursor location. You are then returned to
the plotting. Instructions are included in
the program.

X -i- ( i hND iNKc-Y $ = “' S ” j

Y’+(i hND INKEYa = ‘’7")
Y $ = ” 5 ‘ ' ]i

3 THEN LET ¥=4-3

CU 1:11 1:1.1 i; i.l Cl.! i; i.l f'lj ( t.l

REVIEWS

BOOK SeOiEU
by Ed Sinipson

(Publisher of Hwite Business News)

HOW TO h^RKET TOUR T] HEX/ SINCLAIR SOFTWARE
by R.A.Fauro
Sof bar k Assoc .

210 Fifth Ave.

New York H1 lOOlO
52 pages, 8xll
$12.95

market plan, software security, sofbare
publishers, mail order selling, magazine
aduertising, direct mail marketing, and other
opportunities. These sections are 3 to 10 pages
long and are sometimes further divided into
smaller subsections, Of particular value are the
chapters about developing a market plan, mail
order selling, and direct mail marketing. The last
chapter -covers everything missed in the other
sections and even includes tips on how to get free
publicity.

This hook provides a complete overview of hoi/i to
market the Timex/Sinclalr software that you have
written. Many sources of further information are
included in each section. This manual covers all
the information that a potential software
freelancer needs and is written in an easy to
understand wel 1 organized style.

This book is divided into the following sections:
Defining and developing your product, developing a

This book covers everything you need frc<Ti product
pricing and packaging, to marketing methods. It is
an excellent starting point for the freelancer and
will greatly enhance you^- chance of successfully
marketing your software. 1 like the books style
and content but only wish the author would have
lengthened some sections. Overall this book is an
excellent value for the Tirsex/Sinclair freelance
programmer (and can help any beginning software
marketer).

ANALYSIS

16K RAM, 8K ROM TS-1000/ZX-81/TS-1500/

TS-2068. Stock selection guidance.

Fundamental stock analysis. One-time
input using data in newspapers or
library. Make sound BUY/HOLD/SELL
decisions. Uses Linear Regression
techniques to forecast expected
earnings and corresponding market
price data.

Send $17.99 plus $1. postage and
handling for each tape and tutorial
ordered.

PORTFOLIO

16K RAM. 8K ROM TS-1000/ZX-81/TS-1500/

TS-2068. Investment portfolio file
management. Maintain records of shares,
cost, performance and selling-price-
targets of up to 50 stocks, bonds,
mutual funds. Menu driven. List file,
records; record maintenance or file
update options. Save data across pro¬
gram SAVES/LOADS. Input current market
prices & program recalculates overall
portfolio and individual security
performance as well.

Send $15.99 plus $1. postage and
handling for each tape and tutorial
ordered.

ORION'S BELT ENTERPRISES
807 N. Fairway Rd., Glenside, PA 19038'

(PA RESIDENTS add 6% sales tax)

Please specify computer model .

" ' — - . -'Ml... II , ,.W

COMPUTERS

TRADER
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Articles on MOST Home Computers,
HAM Radio, hardware & software reviews,
programs, computer languages and construc¬
tion, plus much more!!!

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1704 Sam Drive • Birmingham, AL 35235
(205) 854-0271
SampjeCopy $2.50

SOFTWARE REVIEWS by

Tex Fau.c^'tte-

••SCREEN-CRLC" CoPyriSht 1982 by Bant*
SoftWAr*^ 8088 HiQhwood Wjiy>
0r*Ti9»viiU> Cfl 95662

SCREEN-CRLC 1ft a TftAl cutt •Iftctronic
ftPrftftdfthftftt with a number of
interefttin® feAtureft, The documentAtlon
contftinft 23 PeQeft Pluft An Index. Rbout
8 PA9eft consist of a "tAmPle Problem"
which/ when followed ftteP by step by
the first time user/ will serve as a
very 9ood demonstrAtlon of the Pro9rAms
PotentiAl.

stAtements Arc limited to 80 chArACters
(keystrokes)/ An intermedlAte result
msy be stored in An unused cell to be
oPerAted on by a second function
statement to complete the more complex
oPerAtlons. These celled function
statements may use the majority of 1-
stroke functions such as EXP/ RND/ TRN/
SIN/ COS/ SQR/ RBS/ etc.

SCREEN-CRLC has sufficient menus and
sub menus to rate as "User Friendly"/
at least for one experienced in the use
of spreadsheets. The novice in this
area would benefit from a more
extensive tutorial than that suPPlied
in the documentation. I did manA9e to
achieve a few accidental "breaks" while
u£in9 the Pro9rAm/ but was able to
recover and return to the Pro9ram
without losin9 data. Printout is done
with use of the COPY statement/ and
those with wide Printers and
Pra9rammin9 ability mi9ht want to query
Santa concern in9 Possible modifications
to take Advanta9e of their individual
hardware caP abilities.

The Pro9ram will hold uP to 1008
"cells" with a minimum of ten elements
in each direction. Three columns and
six rows are displayed at a time/ with
the center (active) column and row
displayed in a removable box. Display
way be shifted one Position in any
direction with cursor keys/ three
Positions with shifted cursors/ or a
;^’JumP" can be called to any Position by
jlPecific column and row number. The
kser can desi9n a sheet of any size
jiwithin the 1008 cell limit). Banta
Recommends a Preliminary desi9n be laid
put with Pencil and Paper/ as the
'<Jefti9n is entered as (columns) x
jCrows)/ i.e./ 10X20/ and the 2068 does
ihe rest. Data SRVED can be re- loaded
on a new sheet of the same dimensions.

1 have a stron9 suspicion that this
pro9ram was ori9inally written for the
§Pectrum. 1 base this on the fact that
the instructions for insert in9 text
(^ention that the Shift 8 must be used
for insert in9 sPaces/ and that attempts
to use the space key will result in a
? break". This is not true for the 2068
in my experience. If it should happen.,
a GO TO 1200 is supposed to recover.
The instructions also contain reference
to " IF. . .THEN. . .ELSE command"/ which
may confuse some 2068 users! Not to
worry/ specific instructions for this
command follow/ and an example is 9iven
later on in the manual.

In sPite of these minor deficiencies/
the documentation seems to be adequate.
Once one has become familiar with the
Pro9ram and entered some data to work
on/ numerous manipulations of the data
may be Performed. While called function

"SCREEN FILE" CoPyri9ht by
Software/ 808B HiShwood
0ran9evale/ CR 95662

Banta

Way/

SCREEN FILE is B#si8ned to run on any
Sinclair ZK-81 Oh Timex Sinclair with
16K RRM. The casette comes with 5 Pa9es
of documentation which Includes a l-l/'2
Pa9e "sample Operation". Pro9ram is
recorded once on both sides of the
casette.

SCREEN FILE features simple menu
options and screen Prompts and could be
used for a variety of applications
ran9in9 from a simple name/ address/
Phone number file to a file containln9
uP to 6 additional lines of data
foUowlno the Prt-dimtnsloned name/
address/ etc. blocks. Files may be
searched by name/ number/ or element of
* *»*'-ch line"/ and may be
modified/ saved and Printed. Re- load I n9
time for a file contalnln9 data is
dependent on the amount of data stored/
which may be in excess of 17/800
characters.

While SCREEN FILE Showed an excellent
response to keyboard input/ there are a
few features I was not haPPy with. When
a file WAS Printed (evidently with the
COPY command) the menu selections are
Printed as the first line. This could
be trimmed off with knife or scissors/
but who wants to bother?. l also
manaOed to achieve a "keyboard lock"
while attemPtln9 to "nODIFY" a file and
was unable to recover from that
condition without total loss of data.

Conclusion- SCREEN FILE needs a bit of
modification.

devoted

"GRIDLOCK

SOFTWARE,.

92014

The "GRIDLOCK"
©amee for
T i meX'^S i ric I a i r

casette coTitains
the umexPand
computers.

-hTcT a missir)9

*niF ba entering coordinates on a 15 x
20 9rid. "Robot" lets you repack
cartons,. aQain by entry of coordinates
in a from "to" sequence. "Easy Plot"
IS a simple Pro9ram to display the Plot
of equations for Y as a function of X.

The carton which contains the cassette
indicates the Program is for a9es 10 UP
I believe that 2-BIT SOFTWARE is 9uilty
° . L ■ underestimation of th*'

soPhistip,tion of todays kids,, and would
not hesitate to turn these Programs over
^o kids from grades "K" on uP ,. with a
bare minimum of instructions!

BOOK REVIEW bs Tex F,uc»tt.

BASIC

lies sybeJ '*■

o Iric./2344 S:

Bwrkeley^ Cfl 94710.

PROGRAMS IN
■t, Copyright
xth Street,

The author, Stanley p

boor'^Jf iFArojch'ln hf!

o? H. Provides » serlM

b«lS Of ^ISsiC ’’''‘’*7"“ the wist

ceeirel°%K;ib«'‘

combi ^ i”” Which may be

with the expanded TTskT^Tx’s [000^
programming knowledge is required! ‘

featuring calm laf <«•-,« ©..^tate.

Payments, monthly

-pTir e-iii",

contains simPle data anal 5

our g?iSr^, had to expand

e ♦f’e '■ight keyboard,

IS? cop“‘' "O* '» top'' ‘t up ,0 you, TS1000/

‘ ■‘"’'"0 Stieod Fuodons (like

1 * ^ Schematic of the computer

3.C.,., p,.„,o

compiden, you eXSu^^’'"’'”' iT-XSltpUi

W.M. - Camden, SC

. . looks great, you’ve got a fantastic product there,”

_ _ _ _ _ R. j. - Cypress, CA

MULE Electronics - Dept.aiop

Lincoln Blvd, 51195 *

Venice, CA 00231 * *

For 16K TSIOOO, 1500 & ZX8f

20 PROGRAMS

ON 2 CASSETTE TAPES

for the amazingly low price of
not $39.95...not $29.95...0NLY $19.95

(TS2068 version only $29.95)

Save money, learn about the exciting world of home comput¬
ing and have fun doing it with the new HOME-PAC™ from
SIMPLEX SOFTWARE.

COMPUTER LITERACY

Designed with the beginning computer user in mind, the
HOME-PAC covers more application areas than any other
software package available. Discover and explore educational,
recreational, home-finance, graphics & utility applications.
The HOME-PAC includes such exciting programs as star
invader, biorhythms, checkbook balancer, statistics, Comp-u-
sketch, animals, micro-organ (music), machine language
monitor and many (12) others. Also included is a well written
easy-to-follow user manual that takes you step-by-step through
each of the 20 challenging programs.

HIGH QUALITY

The programs are well written and user friendly. The 2
cassette tapes are high in quality and unconditionally guaran¬
teed for 1 year to load & run. The 21 page user manual is in a
class by itself, and the packaging includes free Norelco type
hard storage cases.

MONEY BACK GUARANTEE
We are so confident that the HOME-PAC represents the
most outstanding value in home computer software available,
that we are offering an unheard of 10 day no-risk money back
guarantee.

10 DAY NO-RISK GUARANTEE
If not completely satisfied, return in original condition for a
prompt refiind.

Order today, offer good for limited time only!

SIMPLEX SOFTWARE

Dept. B2, 220 N. Centre St., Merchantville, N.J. 08109

Please rush my order for the HOME-PAC, with 10 day no risk
guarantee, at $19.95 ($29.95 for TS2068 version) each plus $2.00
postage & handling. Outside USA Add $2.00 per order.

Q Payment Enclosed $ _ Residents of N.J.

Add 6% Sales Tax.

Charge My Q Mastercard O Visa

Card No. _ Exp. Date _

Signature -

Name _

Address _

City _ State _ Zip

□ Send me a FREE brochure.

I^RDUARE REVIEW
by P. Donnelly

ITEM: DK TRONICS KEYBOARD

FROM; DK TRONICS, SUFFERN, WALDEN, ENGLAND

(799-26350)

PRICE; 172.00 ♦ S4H (Depends on exchange rate)

About a month after ray second order (the first
bounced because of some problems with VISA), I
received ray DK‘'Tronics "big* keyboard for ray
TS/1000.

The keyboard case is made of a soft black plastic
and has 40 grey keys and an additional 12 red
keypad keys. The feel of the keys is good and
clear vinyl markers on each key contain the
standard Sinclair codes, as used in the U.K.
(e.g., NEWLINE for BfTER). Inside the case is DK^s
"motherboard* which is simply an extension of the
2X81 buss to the rear of the case, but which has
an extra male connector sticking up. This leaves
the newly exposed rear connector available for
other devices. DK also provides enough room for a
small internal power supply for graphics ROM
assembly. The standard phone plug connectors are
exposed through a slot in the back of the case.

Assembling the DK^Tronics keyboard was easy for
the most part. Standard installation requires
only that the DK keyboard and 2X81 have the screws
holding them together removed and the 2X81 P.C.
board placed inside the keyboard case. The 2X
board plugs in to the motherboard via the edge
connector. Two specially prepared connectors then
simply plug into the keyboard slots. There is one
problem with the standard instalation however. The
OK product is intended for use with a

UHF modulator. These cone out of the case about 1
1/2" further from the back than the USA's VHF
output and and extra 1/2* hole has to be drilled
in the case. This is not a problem, as the
material is very soft and easier to work than
wood.

The workmanship on the board I received was
not very good. I had to realign the motherboard
and found some of the wooden mounting flocks
somewhat off center, as well. Also, DK made no
provision for the Ch2 -Ch3 switch in the bottom of
the case. Finally, an obvious mold flaw mars the
finish on top of my unit.

DEALER INQUIRIES INVITED

other shortcomings include the lack oi a space
bar, the use oi a wooden bottom plate and the
total lack ot sheilding (not required in the UK,
Td guess). These shortcomings are oHset somemhat
i)y the Tine “Teel" of the keyboard, the ease with
which the plastic material can be worked, the
reasonable price and the extra numeric keyboard.
On balance, I would rate the DK's keyboard a
reasonable value for the money, but recommend you
be prepared to use simple hand tools (screwdriver,
hand brace, pliers) to 'finish* your keyboard. I
expect a warranty claim would be tough to follow
up. Do ask for the Overseas price, not the U.K.
domestic price.

SOFTWARE REVIEW; REDALERT
MANUFACTURER: SOFTSYNC, Inc.

William Pierson

REDALERT is one of the best arcade type games
available for the Timex-Sinclair 1000. This
game is written in machine code providing
some very fast action graphics. The cassette
comes in an attractively packaged box with
excellent instructions, including some tips
if loading problems are encountered. The
game requires the 16K Rampack. Once loaded
the game is self-starting. I recommend that
you read the instructions prior to playing
the game for the first time. The numeric

PROGRAMMING YOUR TIMEX / SINCLAIR 1000 IN BASIC by

Mario Eisenbacher. An easy-to-digest format leads you through
hands-on examples of programs in eorly chapters, then helps
you develop skills you need to grasp and execute more complex
programs. At eoch new level of understanding you get a
vocabulary with definitions; a short, fancy program to run, prac¬
tice programs, exercise problems with answers, examples of
errors along wifh explanations of how to prevent and solve
them, ond a summary of what you’ve learned.

30 GAMES FOR THE TIMEX/ SINCLAIR COMPUTER by Bill L.
Behrendt. Develop computing and problem-solving skills with
challenges in deep spoce; gomes that forecast the future,
magic mazes ond treacherous trials; oncient and modern war
gomes, cliff diving, a reel predafor/prey simulation, o chance
to be an artist; ond more. These exciting, all-new games with
graphics come complete with instructions for running and
ploying.

TIMEX /SINCUIR INTERFACING: TESTED PROJECTS FOR THE
XZ80, 2X81, AND THE TIMEX /SINCLAIR 1000 by James M
Downey and Don Rindsberg Now you con understand, design,
ond go on to octuolly build useful input/ output devices for your
computer. This book presents o series of step-by-step instruc¬
tions for such projects os o relay controller, digital-to-anolog
converter, joystick interface, printer interface, onalog-to-digital
converter, ond dumb terminal configurotion. Supplies you with
construction techniques, programming considerations, trouble¬
shooting plans, BASIC listings for all programs needed, print¬
outs for the progroms used, and chip data.

~ =Prentlce-Hall=. =

I RETURN TO: Prentice-Hall / P.O. Box 512, W. Nyack NY 10944 I

■ Msir Timex / Sinclair 1000 In ■

BASIC (729871-4) @ $13.45 hardcover (reg. $17.95). _ copy(s) of 30 *

(918904-1) @ $7.45 hordcover I

■ i - copy(s) of Timex / Sinclair Interfacing (921759-2) @ |

_«13.45 hardcover (reg. $17 95) Poyment enclosed (publisher poys post- *

■ oge, money-bock guorontee) Bill □ me Bill my □ Visa or □ Mastercard I

I (New Jersey residents please odd applicable soles tax) ■

I* - - - - - ——Exp. _ _ I

Isionoture _ _ ■

_ - - - - - - ^ - ■

■Nome (print) _ _ |

-Zip — _ _ _

6P20005-A1(2)

keys 6, 7, 9 and 0 provide the movement
controls for the ship as well as the fire
controls for missiles and bombs.

The game starts with the ship appearing on
the left hand side of the screen, the ground
scrolling form right to left to give the
illusion of movement. As you "fly" along
fuel dumps (graphic H), enemy missiles
(letter A), and enemy fighters ( ) appear as
targets for your missiles and bombs. You can
burst fire five missiles or drop three bombs
at a time. Enemy fighters can also fire back
at your ship. So be careful.

You are allocated three ships and 1000 units
of fuel. The game continues until all three
of your ships are destroyed or you run out of
fuel. There is no provision for getting
extra ships or fuel. Once a ship is de-
stroyed, there is a brief pause, then the
game continues.

Initial impressions of REDALERT are very
good. There is none of the blinking effect
noted in some of the previous ZX/Timex games.
The small TS keyboard does require some
getting used to, but after several games you
can easily manuever your ship and zap the
enemy targets. The game loaded the first
time without difficulty. There is a pro¬
vision to save the game with variables to
keep track of the highest score.

Included in the instructions are some ad¬
dresses to change game val-ues; for example,
the number of ships, fuel dumps or enemy
fighters. Tliis information is useful for
increasing the difficulty of the game.

This has to be one of the best TS games I
have seen on the market. The fast action
graphics make the game interesting and
exciting even after several hundred games.
REDALERT is well worth the price of $15.95.
I can highly recommend it to those who want a
challenging game.

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There are two new advanced ccmputers on the
market that may be of interest to Timex and
Sinclair users.

The Sinclair QL (Quantum lp;;p:>

As reported last issue the QL is a new
business and personal computer from Clive
Sinclair and Sinclair Research, Ltd. The QL
is already available in England, and
Sinclair had hoped to be selling the
computer to mail order customers in the U.S.
by the third quarter of this year. However a
recent hold~up in component delivery will
probably delay LI.S. availabil ity until the

640K). The main microprocessor is a 32-bit
68008 chip containing SuperBASIC and QDOS.
SuperBASIC is an enhanced BASIC featuring
user-friendly commands and flexibility. (For
the QL;. Sinclair has abandonned its one-
touch keyword system). The operating system,
QDOS, is multi-tasking and can maintain up to
20 program "windows" simul taneousy. QDOS
also can support a 256-user local area
network. The display is 85 columns by 25
rows (516x256 pixels, hi-Tes)or 40 columns
by 25(lo-res).

fourth quarter. The announced price is $499. Four sophisticated programs are provided

The QL is said to be canparable to the Apple
Mcintosh in every way except price - the Mac
sells for about five times as much. The QL
features a 65-key keyboard, two built-in
microtape drives, 128K fWI (expandable to

with the QL; Quill - a word processor;
Abucus - a spread sheet; Archive - a data
base; and Easel - a graphics package. (All
programs can share data with each other.)
Ports are provided for a modem, a printer,
joysticks, a monitor, a TV. and ne

The Memotech HTX-512

DISPLAY; 256 X 192 resolution , 16 colors which

For the last year and a half Memotech
Corporation has developed and sold RAM paks,
EPROMS, printer interfaces, and keyboards for
Timex Sinclair Computers. With the announcement
last year that Memotech was developing its oun
microcomputer, many Timex users were naturally
interested. The Memotech Krx-512 computer is now
available. The advertisement appearing in several
computer publications is very impressive. 64K R^
built-in, expandable to 512K (thus MTX 512), plus
seperate 16K RAM for video output with a seperate
processor.

can all be used simultaneously, 32 sprites, and
eight user-definable windows.

INPUT/OUTPUT; Centronics parallel printer port,
two standard joystick ports, cassette port (2400
baud) separate TV and monitor ports, 4-channel
hifi port, ROM cartridge port, plus a uncommitted
parallel I/O port (all standard).

LANGUAGE; MTX BASIC with abbreviated commands, MTX
GRAPHICS, NODDY - an II - command language for
children, and MTX ASSEMBLER (built into 24K ROM).
PASCAL and FORTH availabe as add on ROMs.

KEYBOARD; 81 keys with numeric keypads, 8 function
keys, auto repeat.

JRC Software
Software for Sinclair and
Timex Sinclair Computers
Call (812) 752-6071 or 752-5106
John Richard Coffey
28 P.O.Box 448

Scottsburg, IN 47170

ITEM; Software 4ron\ JRC, PO Box 448, Scottsburg,
IN 47170.

For the TS 2068

-The Great Graphics Show; The examples above are
just two ot the many graphics display that can be
done with the 'Great Graphics Show.*

-Three Games Package: Paint and draw with
Colorsketch, using your joystick more than 12
single keystroke commands. 'Timing the Trash
Compactor* is a cleverly animated game tor
children and adults. *0odge-em* is a clasic race
game with a surprising twist, fast and tough.
-Hi Res Lander; The clasic space game with
high-resolution realism and two difficulty levels.
Requires skill and patience.

-Oscilloscope; Real time three-dimensional rotaion
with dozens of possible patterns.

-Touch Type Learning Game; Introduces 197 symbols
and tracks your progress. Educaional but fun
game.

-Easy Editor; Fastest and easiest text editor ever
in BASIC.

All six of these programs are available for $24.95
on a high - quality TDK tape. Also available
seperately for $9.95 each.

For the TS 1000/1500

-Super Tape; Include Super Function Plot, 4-2K
action games. Touch Type Teacher, Extensions to
BASIC, Upper/Lower case on printer. Hi -Res on
printer, and many more programs, mostly in machine
code, on TDK tape for $24.95.

CURRY COMPUTER

Software & Hardware
T/S 1000 and T/S 1500
T/S 2000 Series
Write for FREE Catalog
Over 60 Programs/Keyboards/Rampacks
DEALER INQUIRIES WELCOME
5344 W. Banff LnJGlendale, AZ S5306
1-602-978-2902

KELTINORS KISEP {l6K)

A realistic adventure involving
fighting, bribing, strategy and luck.
Many rooms , levels , weapons , treasures
and magic items. Dungeon and objects
set up RANDOMLY. Packed with suprlseSk
On cassette-$6;95.Free catalog with
order. Send cheque or money order to:
MILL RESEARCH 32749 Avalbn Gres.
Abbotsford , B.C«, Canada V2T 3W9

ITEM; 5 programs -for the TS 2060 -from Sottsync,
HE. 4th Street, NY, KY 10016.

“Gulpman: PacMan-Type game except Gulpman can
shoot at his attacker. Joystick or keyboard
control. 15 nazes and 9 speeds. (Ed. note: 1
liked it).

-Cyberzone; Space game. Voice-activated tiring
(no joke!), joystick/keyboard control. Nice color
and very fast. (Ed. note: Tra hooked).

-Voice Chess; Several ditticulty levels. Computer
talked to the player with mildly sarcastic
vocabulary. Nice game.

-Personal Accountant; General ledger, amortization
program, address tile with 15-page booklet.

-Zeus Assembler: Machine Code programing.

All programs on cassette ($19.95, except
Accountant, $24.95). These programs will be
reviewed in upcoming issues.

HEM; Apropos Technology announces three new

program packages tor the TS-1000 and TS-1500

DR. FLOYD; A psychoanalytic artiticial
I n tell I gence program which allows the player to
carry on a "conversation" with the computer. Great
tor showing others what a small computer can do.

GfWPHlCS PAK 1; A collection ot tive programs
which allow the user to draw pictures on his TV
screen through keyborad control. All creations can
be saved to tape and recalled. One program allows
placement ot any character anywhere on the screen.
WORDPLAY; A collection ot tive English language
programs which teach the player important points
ot grammer and literature in a tun and stimulating
manner.

All require 16K ot memory and sell tor $12.95 plus
$2.00 S & H.

Mutual Funds Investors
Timex 1000 Users

Two 16K programs to cover
the mutual funds.

1. Mutual Fund Minder

• Keeps track ot stocks you own showing
current value of investment, per cent gain
or loss, and other data.

• Compares your account to others you
select.

• Prints summary, details, and a graph, for
quick analysis.

2. Mutual Fund Master

• Store entire mutual funds listing, up to 600
stocks.

• Select printout; choose minimum per cent
gain for printing.

• Automatically prints when screen is full, if
desired.

• Ideal for selecting funds for more frequent
looks with Mutual Fund Minder.

The two programs compliment each other,
and most complete analysis is accomplished
by using both.

Programs are menu driven, and user friendly,
with built in extras to facilitate use. Instructions
with cassette.

PRICE: $19.95 each, or both for $34.95 + $2
shipping. California residents add 6V2% Sales
Tax.

Compare this low price to what you would pay
to subcribe to an analysis service.

For Free Literature

STOCK MARKET SOFTWARE
1556 Halford Ave. #236
Santa Clara, Ca. 95051

Partial Pascal

Pascal is a computer programming!
language, very popular on microcom-j
puters, invented by Professor Niklaus'
Wirth of the Swiss Institute of I
Technology. Partial Pascal is a subsetj
of Pascal for the ZX81, Timex Sinclair
1000 and 1500.

Partial Pascal includes IF, THEN,!
ELSE, CASE, OF, OTHERWISE,
WHILE, DO, REPEAT, UNTIL,
FOR, TO, DOWNTO, BEGIN and!
END for program control; read readln,
write, writeln, reset, rewrite, eoln, eof,
inkey and text for input and output; +,

*, DlV, MOD, abs, chr, odd, ord, pred,
succ and sqr for calculations; NOT,
AND and OR for decisions; PRO¬
CEDURE, FUNCTION and FOR-
WARD for subroutines; CONST,
TYPE, VAR, ARRAY, Boolean, char
and integer for data; copy, fast, slow,
pause and halt for computer control;
plot and point for graphics; and mem,
mem2, memw, move and usr for
machine language.

Partial Pascal executes much faster
than BASIC because, as a compiled
language, it doesn’t have to search thru
tables to find variables or search thru
line numbers as BASIC does for each
goto, gosub or next. Partial Pascal’s
16-bit integer calculations are much
faster than BASIC’s arithmetic.

Please note our new address. Partial
Pascal is supplied on cassette tape with
instruction manual. 16K RAM required.
$30 postpaid from

Semper Software
585 Glen Ellyn Place
Glen Ellyn, Illinois 60137

DATA ACOUiSITIOIM & T
CONTROL SYSTEM FOR |

THE ZXB1/TS1000/TS1S00

* CENTRONICS PARALLEL PRINTER INTERFACE
Supports LPRINT. LLIST, « COPY Keys

* REAL TIME CLOCK CALENDAR CHIP
Battery Backup DY/MO/YR HR/MN/SC

* ANALOG TO DIGITAL CONVERTER

8 Channel 8 Bit 0-5 Volt Inputs
100 Microsecond Conversion Time
» DIGITAL INPUTS - 8 TTL Compatible
Monitor Switches, Contacts, etc
» DIGITAL OUTPUTS - 8 TTL Compatible
Control Relays, Motors, etc.

* ADDITIONAL FEATURES: Bus connector for
other accessories. Resident EPROM with
Software for all on-board devices.

User's Manual with Applications

"REPORT GENERATOR" AST + manual $89.95
Kit with parts 8 manual $69.95

Bare Board, software 8 manual $32.95
Add $3.00 for shipping USA

Service Available for c heckou t / repa i r

Dealer inquiries accepted

Send check or moneyorder. We also
accept MC/VISA or call for C.O.D.
shipment via UPS to:

ENER-Z COMPANY

P.O. BOX 635

fort WASHINGTON, pa

BIB-TST-oaSA 1S03A

The following is a list of good to
excellent newsletters that we have seen from
various Timex/Sinclair user groups.

T.S.U.6. Newsletter (tlO per year-monthly)
Triangle Sinclair User Group
c/o Doug Dewey

206 James St., Carrboro, NC 27510

C.A.T.S. Newsletter($10 per year monthly)
Capitol Area Timex Sinclair User Group
P.O.Box 725, Bladenburg, MD 20710

Keyboards ($15 per year-bimonthly)

Timex and Sinclair Bay Area Microcomputers
P.O.Box 644, Safety Harbor, FL 33572
Editor; Mel Routt

TimelineZ (fl5 per year-monthly)

Bay Area T/S User Group
P.O.Box 1312, Pacifica, CA 94044
Coordinator: George Mockridge

Boston Computer Society
Sinclair Timex User Group
Three Center Plaza, Boston, MA 02108
Director: Sue Mahoney

1 6K TS 1 000/1 500 ZX81

- presenting -

RANDOM SCRAMBLE

A challenging educational word game
for your entire family. Helps build todays
necessary vocabulary and spelling skills.

- FEATURES -

1 to 4 Players - 1 to 1 5 Rounds -
4Levelsof difficulty - Double option —
Constant score display - Current/
Remaining round display- Unique end
of game player recaps display all play, by
round, for each played -2500 Word built
in (bypassable) dictionary! - User friendly.
Send $13.95 & $1.75 postage/handling.
Visa/MC send number & expiration date.
CT. residents please add $1 .05 sales/tax.

FUSION MICRO PRODUCTS

PARK SQUARE STATION
P.O. BOX 15388 A
STAMFORD, CT. 06901

CASSETTE TAPES- the highest quality tape is
used to make these computer quality cassettes
in a popular C-20 size, 10 minutes per side
make these perfect for 16K programs. Each tape
cofTies with two blank labels and a plastic
case. Only $.80 each in quantities under 10.
10 for $7.50, 25 for $18.00, 50 for $34.00, or
100 for $63.00. On orders below $15.00 include
$2.00 for shipping, on all others we pay
shipping. Send check to; WMJ DATA SYSTEMS, 4
Butterfly Drive, Hauppauge, NY 11788, We have
other size tapes available, send size needed
and we will quote price.

CHECKREC— Introductory offer. Keep track of
your checking account on a MC spreadsheet.
Program will also reconcile your account
account to your bank statement. TS1000/ZX81
with 16K. Provides hard copy if printer is
used. Cassette $10.00. WMJ DATA SYSTEMS, 4
Butterfly Drive, Hauppauge, NY 11788. We have
other software.

RAPID FILE, 16K, Basic/MC, more features,
$10.95. Rapid Finance, 16K, 500 entries,
$10.95. 3D Graphics, 16K or TS2068, please
specify, tape $8.50, listing $2.50, Russell
Brewer, 26630 Mill Rd., Frazeysburg, OH 43822.

Hum n-TS sinwii

■UCKJACX (Th* gam« of 21) (16K)

Enjoy this oxciting gamol Up to 6 ployorx may
play. AH hands simuHanaously displayad. Las
Vagas rulas apply, with compwtar holding all
batsi Allows fitting pairs, doubling down ft
insuranca. Graat for tasting your stratagy.

NHeHif UMUEKI (Manu drivan) (1 6K)
Providas quartariy graphic display of your bill
status, with bills duo saarch 1^ dasirad data.
Summarias of axpansas paid, avaragas. ft
oxpansa as % of incoma. Printar option
indudad. '

CUEIUI PUMEI (Manu drivan) (16K)
Scratchpad calandar. Up to 200 parsonal
avants may ba filad. Add or daiats anytima.
FHos stay in ordar of data! 12 aoarch modos
dteplay appointmants, auto mant.. Hot«ay
Do's, jobs, ate. Also allows viawing dasirad
waak, month, or yaar.

$9.98 aach indudaa postaga (Ca. ras. add
Salas Tax)

A rsr hM trssim twd lUE -k

!.■.$. HTEiraiKS
In SMS

iMCiHir. (s. IHN

. 1/ THE

iWi‘ WIZARD

tr WORKS

1(616)173-5164
Tvnpfwimt . $7.50

A Texi H«ndlin| Proffim

STATISnai GRAPH UNftATOR . $7.50

A Grtph Rroducinf Pro^f am

MUS AMAim.. . $14.50

A Saks Report Profrsm

HOME luocn GRAPHER . $7.50

A Home Bodtet Pro|ram

UVESOrSHTRA . $$,50

A Game at Skill and Faie lhrou|h the Mafic Cam

HARRY HO A THE MSAPPURIHG MAMONDS . . $0.50

An Interactive Adventure Game

MIX aiCUUTOt . $7.50

A Proframers AddrcM Cakulaior

SYMKH TAiU CCNitATOI . $7.50

An A&zmic Fik Utiliir
(AM Proipvw UKJ

* 9m man ktinmisM t fttp'mm wttf hi

ttmhrpiip— tndniWslA 51.54 fwWntbisjhS Hi
TIm Whanl Wslii

_ lai 45, Wa»sryMa, Ml 40450

MNMMaMMsa«MMMnmsinmmNMtniMwa«6iMnKwn«(«6

P.S.

A few parting comments

- If you like T-S Horizons, please let us know. We welcome all
constructive criticism, because we do want to become the best Sinclair
magazine you can buy.

- If you like us, support our advertisers. And be sure to mention where
you saw the ad.

Most importantly, if you have any bad experiences with our advertisers
- or any company dealing with T-S/ZX related items - please tell us. We
iiot print ads from dishonest, unscrupulous companies, or from those
who sell products that do not live up to the advertising.

Thank you,

Rick Duncan, Publisher

CHRISTIAN SOFTWARE

Bible Story Software

for T/S 1000

David & Goliath 12.95

The Ark 12.95

$1.50 shipping 7 handling
others availame - send for free flyer
Box 547, Bettsville, Ohio 44815
1-419-986-5217

5:ife

POWER SAVER 1 000 & 2000
BATTERY BACK-UP

UNINTERRUPTABLE BATTERY BACK-UP FOR
ZX80, 2X81, T/S1 000, T/S1500, AND T/S2068

ALLOWS HOURS OF PORTABLE. FULLY
OPERATIONAL, COMPUTING.

RECHARGEABLE BATTERIES INCLUDED
IN CASE WITH LED TEST INDICATOR.

RETAINS MEMORY WHEN AC FAILS.

FULL 90 DAY WARRANTY!

H & Z ELECTRONICS THE BATTERY BACK-UP SPECIALISTS"

OFFER MANY FEATURES NOT FOUW I N “STMIL AR UNITS

Power Saver 1000-2000 is the state of the art in solid state design,
in which numerous production models have been desioned, built and tested.

In respect we came up with a memory savino computer aid that allows fully
operational computing when AC fails to operate the computer properly.

The P/SIOOO is fully incased with the highest quality rechargeable
batteries available to meet the demands of your computer. Once discharged
the batteries can be charged in either one of two positions explained in
further detai 1 :

CHARGING:

Due to the unique design of the P/S1000-P/S2000 it allows you the
choice of a "Fast" or "Slow" (trickle) charge position.

SLOH - With the P/ SI 000- P/S2000 in the slow position the user has
full use of all of the computers functions, along with it
capability of retaining memory when AC fails to run the
computer properly. In this position the batteries are
trickle charged as needed to keep them in peek operating
conditions without affecting the operation of the computer
in any way.

TAG T - This position has been built in for those of you who may
wish to make your computer portable. In the fast charge
position it allows you to restore the necessary charge to
the batteries overni ght (approx. 6 to 10 hours from minimum
operating point)*. However, in this position it is not
possible to run the computer due to the fact that all of
the supplies power is delivered into charging the batteries.

‘(NOTE: Due to the self regulation of the P/SIOOO it is not possible
to overcharge the batteries in either the fast or slow charge position)

FULLY RECHARGES WITH COMPUTER'S * PLUG IN INSTALLATION, NO MODIFICA-
POWER SUPPLY. CATION NEEDED.

P/S 1000

ZX80, ZX81 , T/S1 000, T/S1 500
$59.95 -BLACK

P/S 2000
(T/S2068)

$119.95- SILVER

LED BATTERY TEST:

The P/S1000-P/S2000 has a built in battery test feature that you will
find quite unique and helpful. It is extremely easy to operate by depress-
Ing the push botton switch on the P/S1000-P/S2000 labeled "Battery Test".

It will indicate the batteries capabilities. If the LED lights brinhtly
there is enough of a charge to operate the computer. The LEO will consis¬
tently dim with the capabilities of the batteries to run the computer
properly. When the LED does not light, it simply means the batteries are
undercharged and are not reliable to run the computer.

WARRANTY :

The P/ SI 000- P/S2000 Is guaranteed to be free of defects due to workman'
ship and components for 90 days from the date of shipment. If necessary,
the P/S1000-P/S2000 may be shipped to us for repairs. If out of warranty -
repairs will be made at a minimal cost.

(PRICE INCLUDES SHIPPING AND HANDLING)

Due to m

anufacturi

ng changes

- charge ra

ites I

nay vary slightly

(Wl RESIDENTS ADD 5% STATE SALES TAX)

SPECIFICATIONS:

SEND CHECK OR MONEY ORDER TO:

T/SIOOO:

APPROX. 3

-1/2 Hours

of Battery

Li fe

With T/S1016

APPROX. 7

Hours

of Battery

Life

Without T/S1016

H & Z ELECTRONICS

T/S2000:

APPROX. 7

Hours

of Battery

Li fe

With T/S2068 '

P.O.BOX 8761

MADISON, Wl 53708

The HUNTER Board

Add Memory that won’t Forget!

DESCRIBED IN JULY/AUGUST 1983 Badio EICOtrolliBS

^ ADD YOUR OWN SYSTEM UTILITIES

UP TO 8K NONVOLATILE RAM

BUILD UP A LIBRARY OF MACHINE
LANGUAGE SUBROUTINES

USE HM6116LP CMOS RAM
OR 2716/2732 EPROM

COMPATIBLE WITH
16K RAM PACKS

$3295

plus $1.95 shipping and handling

What a super product!... conceived and executed very nicely... and with quality components.

(SYNTAX QUARTERLY Winter 82)

For versatility this is even better than an EPROM... ranks quite high on the list of “must-haves”...

(SYNC Magazine Mar/ Apr 83)

Provides the user with instant software... an extremely versatile memory extension...

(Z-WEST June 83)

Complete kit with one 2K 6116LP-3 . $32.95

Additional three 6116LP-3 . $25.00

Bare pc board & manual . $13.05

Female connector 23/46 gold bifurcated . $ 5.00

Kit for EPROM use only . $22.95

Assembled & tested with 2K . . $47.95

Assembled & tested with 8K . $65.95

Shipping & handling per order . $ 1 .95

Send check or money order to the address below:

HUNTER, 1630 FOREST HILLS DRIVE, OKEMOS, Ml 48864

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